% compute the reduction error with the probability of 1 = alpha
function err_red = ccm_rd(m, n, r, k, alpha)
err_red = double(0);
%Compute E_reduction, it's mean of truncated part(in Partial Products)
for q = r+k+1:m+n
    err_red = err_red + (m+n+1-q) * 2^(-q);
end
err_red = alpha^2 * err_red;
end